JP5394731B2 - Cold storage - Google Patents

Description

  The present invention is suitable for being applied to a cold storage mounted on a transport vehicle such as a cold storage vehicle, and relates to a cold storage that can make the temperature distribution in the storage uniform.

  Low temperature distribution is being established in the domestic and overseas food distribution fields. As a low-temperature distribution means, for the distribution of food from a food processing factory to a store, transport by a cold storage vehicle such as a refrigerator, a refrigerator, or a truck equipped with a cold storage is indispensable. There are trucks, trains, ships, airplanes, etc. in addition to cold trucks, but the higher the load capacity, the greater the mass transportation possible and the lower the transportation cost. Demand for using large cold storage is increasing.

  In the case of a cold storage car, a truck, etc., the cold storage requires a refrigeration apparatus having a higher cooling capacity as well as a larger capacity, and equipment that makes the temperature distribution in the storage uniform. However, since the space in the vehicle width direction is limited in the case of a cold car, if the capacity of the cold box is increased, the space in the longitudinal direction of the vehicle body must be increased. In addition, there are restrictions on the size and weight of the cool box itself, and priority is given to the load capacity, so the scale of equipment is naturally limited.

The higher the cooling capacity of the refrigeration equipment, the higher the compressor power, and the refrigeration equipment is driven by the engine, resulting in an increase in fuel consumption. An increase in fuel consumption leads not only to an increase in transportation costs but also an increase in CO ₂ emissions. Due to recent revisions to energy-saving laws, transport operators and shippers in the transportation sector are required to make efforts to save energy, and temperature management in the refrigerator is required to be strict.

In the past, the present applicant has made several proposals regarding a low-temperature distribution system for food using a cold car.
For example, in Patent Document 1 (Japanese Patent Laid-Open No. 2006-242462), a tank or a refrigerator unit for storing a latent heat regenerator material such as brine or ice slurry is provided on the ground, and a supply pipe and a recovery pipe for the latent heat regenerator material are provided in the cold storage vehicle. We propose a base function system that makes it easy to attach and detach, and supply the latent heat storage material to the cold storage and easily collect the latent heat storage material from the cold storage.

Moreover, in patent document 2 (Unexamined-Japanese-Patent No. 2006-242487), the ice filling rate in a cooling panel is filled when latent-heat storage materials, such as a brine or an ice slurry, are filled into the cooling panel of the cool box mounted in the cool vehicle. Has been proposed to increase the cooling capacity and reduce the power of the transport pump.
Moreover, in patent document 3 (Unexamined-Japanese-Patent No. 2008-164253), the storage tank of latent heat cool storage materials, such as a brine or ice slurry, the heat exchanger which cools the air in a cool box, and the latent heat cool storage material in a storage tank are comprised. A cooling system has been proposed in which a pump or the like for supplying to the heat exchanger is mounted on the vehicle body and the cooling rate in the cold storage can be increased.

JP 2006-242462 A JP 2006-242487 A JP 2008-164253 A

  As demand for large-sized cold storages for transport facilities increases, when transporters such as cold cars are limited in space in the width direction of cold storage vehicles, the space in the cold storage is limited. A long space in the longitudinal direction of the car body must be taken. Therefore, there has been a problem that the temperature distribution in the longitudinal direction of the vehicle body in the cold storage varies. That is, in the cold storage vehicle, since the refrigeration equipment is driven by the engine, the refrigeration equipment is provided near the side wall on the front side of the vehicle body close to the engine. Therefore, the heat exchange part (evaporator etc.) and the cold air blower outlet which comprise refrigeration equipment are also provided in the vicinity of this front side wall.

  For this reason, the cold air blown from the front of the cool box does not reach the rear, the front area of the cool box cools, but the rear area near the rear door does not cool, and temperature unevenness occurs in the front and rear direction of the car body of the cool box. It has occurred. The space from the upper surface of the cargo to the ceiling inside the cool box forms a cool air passage, but the cool air passage also serves as a cool air return passage, and the cool air returns near the center of the cool box. Currently.

  In the case of a refrigerated warehouse or a frozen warehouse installed on the ground, the number and arrangement of evaporators are determined in consideration of the cooling capacity and the temperature distribution in the warehouse. However, as described above, in the case of a cold car, since the place where the evaporator is disposed is limited to the vicinity of the driver's seat from the point of driving the engine of the refrigeration equipment, it is difficult to make the internal temperature distribution uniform at present. It is. No means for solving the problems related to Patent Documents 1 to 3 is disclosed.

  The present invention has been made in view of the problems of the prior art, and an object of the present invention is to realize a means for making the temperature distribution in a cold storage unit mounted in a transport vehicle such as a cold storage vehicle, a truck, a train, a ship, and an aircraft uniform. .

In order to achieve the above object, the refrigerator of the present invention is:
In a cool box equipped with an air cooler mounted on a transport and having an inlet and an outlet at one end of the cargo space,
A cold air duct is connected to the air cooler, the cold air duct is extended to at least a central area of the cargo space along the ceiling surface, and the cold air is blown out from the outlet of the extended end;
The cool air blown out from the outlet is returned from the end area of the load space along the uppermost surface of the load toward the air cooler inlet, and the load is placed by descending from the end area of the load space. A lower circulation flow returning toward the suction port through the ventilation space formed in the pallet, and a return flow path for guiding the upper circulation flow and the lower circulation flow to the suction port, and the air cooler A bulkhead is erected with a gap between the inner wall and the vicinity of the inner wall provided with a slit-like upper opening for circulating the upper circulation flow to the bulkhead above the maximum load height, The bulkhead is provided with a slit-like lower opening through which the lower circulating flow is circulated on a surface facing the ventilation space of the pallet .

In the present invention, a cold air duct is connected to an air cooler provided at one end of the cargo space in the vicinity of the driving device of the transport engine, and the cold air duct is crossed from the central area of the cargo space along the ceiling surface across the cargo space. It extends to the region that reaches the end of the cargo space, and cool air is blown out from the extended end.
Then, a part of the blown out cold air flows through the upper circulation flow returning to the inlet of the cooler along the uppermost surface of the load and the ventilation space formed in the pallet descending from the end region of the load space. The lower circulating flow returning to the suction port is divided and formed, and is further returned to the suction port of the air cooler via the return flow path.

Recently, the method of loading cargo in cold storage such as cold cars and trucks has become more efficient, and the cargo has been packed tightly without gaps, so that the top surface of the cargo has almost the same height. It is becoming. In the present invention, the upper circulation flow along the uppermost surface of the load is formed in accordance with this loading method.
In this way, the temperature distribution in the load space can be made uniform by forming a circulation flow of the cold air returning from the vicinity of the end of the load space to the air cooler so as to sandwich the upper surface and the lower surface of the load.

  In the present invention, it is preferable to provide a ventilation hole on the upper surface of the pallet so as to form a diversion flow of the cold air that separates from the upper circulation flow and passes from above to below through the gap formed between the loads. Thus, since cold air can be passed through the gaps between the loads, it is possible to increase the cooling effect of the loads and further improve the uniformity of the temperature distribution in the load space.

Moreover, in this invention, it is good to extend a cold wind duct across the load space to the terminal area of a load space, and to provide a cold wind blowing hole in the lower surface of the cold wind duct from a center area to a terminal area at least. If the cold air duct is extended to the end region of the load space and the blowout port is provided at the extended end, the blowout flow of the cold air collides with the wall surface of the end, so that it is difficult to form the upper circulation flow and the upper surface of the load is There is concern that it will be difficult to get cold.
Therefore, if the cold air blowing hole is provided in the region from the central region to the terminal region of the cold air duct and the cold air is blown downward, the formation of the upper circulation flow is facilitated. Furthermore, the flow rate of the upper circulating flow can be adjusted by adjusting the number and diameter of the cold air blowing holes.

In the present invention, it is preferable that a cooling pipe for flowing a refrigerant or a latent heat storage material is provided in the ventilation space inside the cold air duct, and a fan for forming the cold air in the cold air duct is provided in the air cooler.
When the cold air duct is provided, a pressure loss of the cold air in the cold air duct occurs, and the amount of the cold air is reduced. Therefore, it is necessary to increase the fan capacity, but the installation space for the air cooler is limited. With the above configuration, it is not necessary to provide a cooling pipe in the air cooler, and as a result, a large space for installing the fan can be taken. Therefore, a high-capacity fan is installed in the air cooler in the existing cool box space. Can be installed.

Further, in the present invention, a bulkhead is erected with a gap between the inner wall of the vicinity where the air cooler is provided, and the upper circulation flow is circulated through the bulkhead above the maximum load height. A slit-like upper opening is provided, and a slit-like lower opening is provided in the bulkhead so as to circulate the lower circulation flow on a surface facing the ventilation space of the pallet.

The bulkhead is provided so as not to apply a load directly to the inner side wall of the warehouse and to form a ventilation space. By adopting the above-described configuration, it is possible to easily form a return passage that directly communicates the air inlet of the air cooler with the ventilation space provided above the uppermost surface of the load and the ventilation space provided on the pallet. The formation of the flow and the lower circulation flow is facilitated.
Further, by providing the bulkhead, the load does not directly hit the heat insulating layer provided on the side wall of the cool box, so that the heat insulating layer can be prevented from being damaged and the load collapse can be prevented.

In the present invention, in addition to the above configuration, the opening area of the lower opening is equal to or larger than the opening of the ventilation space of the pallet, and the opening area of the upper opening is 0.1 to 0 of the opening area of the lower opening. .5 times better.
This makes it possible to distribute the flow rate of the cold air so that an upper circulation flow and a lower circulation flow can be formed, whereby the ventilation space can be uniformly kept in the front, center and rear of the load space. .

Further, in the present invention, it is preferable that the transport vehicle is a cold car, an air cooler is arranged on the upper part of the inner side wall near the driver's seat, and the cold air duct is extended from the air cooler toward the rear door.
Since the cold storage mounted in the cold storage vehicle has a limited space in the width direction, it is inevitably necessary to increase the space in the longitudinal direction of the vehicle body when the cold storage is enlarged. Further, since the air cooler is driven by the engine, the air cooler is installed in the cabinet near the driver's seat in order to simplify the transmission mechanism of the engine driving force as much as possible.

  If the present invention is applied to a cool box mounted on a cool car, an upper circulation flow and a lower circulation flow can be formed over the entire area in the longitudinal direction of the vehicle body. The inside of the cool box can be uniformly cooled to the end of the cool box having the.

  According to the cool box of the present invention, in a cool box equipped with an air cooler that is mounted on a transportation facility and has a suction port and an outlet at one end of a cargo space, a cold air duct is connected to the air cooler, The duct extends along the ceiling surface to at least the central area of the load space, and cool air is blown out from the outlet of the extended end, and the cool air blown from the outlet is supplied from the end area of the load space to the uppermost surface of the load. Along the upper circulating flow returning toward the suction port of the air cooler and the ventilation space formed in the pallet on which the load is placed and descending from the end region of the load space toward the suction port Since the lower circulation flow and the return flow path that guides the upper circulation flow and the lower circulation flow to the suction port are formed, it is mounted on a transport vehicle such as a cold car, a truck, a train, a ship, and an aircraft. A simple structure for the temperature distribution in the refrigerator It can be made to be single. Therefore, the temperature control of the load in the cold storage can be accurately performed according to the target value.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

(Embodiment 1)
A first embodiment in which the present invention is applied to a cold box mounted on a cold car such as a refrigerator car or a freezer car will be described with reference to FIGS. 1 and 2, a cold storage car 10 is equipped with a cold storage 12. A heat insulating plate 16 is stretched on the front wall 15 inside the cool box in the vicinity of the driver's seat 14 of the cool car 10. Moreover, the other wall surface of the cool box 12 also has a heat insulating structure. A load f that needs to be refrigerated or frozen such as food placed on the pallet 20 from the rear door 18 is loaded in the cool box 12. The pallet 20 has a height of 150 to 200 mm, for example.
The cargo f is stored in a plastic case or a cardboard box having a size that is usually placed on the pallet 20 as shown in the figure. Since the area where the load f is placed is smaller than the area of the top surface of the pallet, a gap s3 is formed between the loads f even if the pallet interval is narrowed.

  The top surface 21 of the pallet 20 has a structure in which a large number of ventilation holes are arranged in a mesh shape, and the four side surfaces are open so that a conveyance claw such as a forklift can be inserted. The interior of the pallet 20 forms a ventilation space s1 through which air can freely flow. A bulkhead 22 is erected between the front wall 15 and the load f with a gap s2 so that the load f does not directly hit the heat insulating plate 16. The bulkhead 22 is provided with an upper opening 24 and a lower opening 26. The upper opening 24 and the lower opening 26 are arranged in a horizontal direction to form a slit shape, and the lower opening 26 has a larger opening area than the upper opening 24.

  As shown in FIG. 3, the upper opening 24 is provided above the uppermost surface of the load f, and the lower opening 26 is provided on a surface facing the opening of the ventilation space s <b> 1 formed in the pallet 20. In this embodiment, the opening area of the upper opening 24 is 1.5% of the total cross-sectional area of the cool box 12, and the opening area of the lower opening 26 is 10% of the total cross-sectional area of the cool box 12. Is formed.

  An air cooler 28 is provided on the inside upper part of the cool box 12. As shown in FIG. 4, a heat exchanging portion (consisting of an evaporator or a cooling pipe) 33 and a fan 32 are built in the casing 30 of the air cooler 28. The air in the cool box is sucked from the suction port 34 by the fan 32, and the sucked air is cooled by the heat exchanging unit 33 and blown out from the air outlet 36. A cold air duct 38 is integrally connected to the air outlet 36.

  As shown in FIG. 2, the cold air duct 38 has a flat shape and forms a flat ventilation space inside. The cold air duct 38 is attached to the ceiling surface 13 of the cool box 12, is disposed on the entire width direction of the ceiling surface 13, and extends to the central area of the cool box 12. The tip of the cold air duct 38 forms a cold air outlet 40. The blower outlet 40 is arrange | positioned toward the rear door 18 side.

A refrigerant or a latent heat regenerator material flows through the cooling pipes constituting the heat exchange unit 33. In the case of a latent heat storage material, brine or ice slurry flows, and cools the air in the cabinet sucked from the suction port 34. As a means for flowing the latent heat regenerator material through the heat exchanging unit 33, a tank storing the latent heat regenerator material is mounted on the cold storage vehicle 10, and the latent heat regenerator material in the tank is caused to flow to the heat exchanging unit 33 with a small pump. The tank is replenished with a latent heat regenerator material from a supply center installed on the ground.
As another means for supplying latent heat regenerator material, a refrigerator that constitutes a refrigeration cycle is mounted on the cold storage vehicle 10, the latent heat regenerator material is manufactured with this refrigerator, and the manufactured latent heat regenerator material is stored in a tank mounted on the vehicle body. You may do it.

  In such a configuration, the air cooler 28 is operated in a state where the cargo f is loaded in the cold storage 12, and cold air is blown out from the air outlet 40 of the cold air duct 38 to the cargo space S between the ceiling surface 13 and the uppermost surface of the cargo. Cool the interior. The cold air c blown out from the air outlet 40 forms a ventilation channel as shown in FIG. That is, a part is folded back to the front side of the cool box 12 to form an upper circulation flow c1 along the uppermost surface of the load f. A part of the upper circulation flow c1 reaches a lower portion of the load f by forming a split flow c3 passing through a gap s3 formed between the loads f. Further, part of the cold air c reaches the rear door 18, passes through the gap s 4 between the rear door 18 and the load f, and reaches the lower portion of the load f.

The cold air c that has reached the lower part of the load f through the diversions c3 and s4 that have passed through the gap s3 forms a lower circulation flow c2 that passes through the ventilation space s1 provided in the pallet 20 and faces the front of the cool box 12.
The upper opening 24 forms a return flow path where the upper circulation flow c1 returns to the suction port 34 of the air cooler 28, and the lower opening 26 and the gap s2 form a return flow path where the lower circulation flow c2 returns to the suction opening 34.

Therefore, the upper circulation flow c1 reaches the suction port 34 through the return flow path including the upper opening 24 provided in the bulkhead 22, and the lower circulation flow c2 passes through the return flow path including the lower opening 26 and the gap s2. And reaches the suction port 34 of the air cooler 28.
By forming such a circulating flow of the cold air c, a uniform temperature distribution can be formed along the longitudinal direction of the cool box 12.

  Test No. in Table 1 shown in FIG. 1 is a test result according to the present embodiment, and FIG. 6 is a plot of the temperature distribution of the test result. In all the tests shown in Table 1, test conditions were set at a set temperature of 3 ° C. The thermometer for the set temperature is installed in the suction port 34 of the air cooler 28. When the set temperature is 3 ° C, the cooling device automatically stops (cooling off) at the suction port temperature of 3 ° C, and the suction The cooling device automatically operates (cooling on) when the mouth temperature is 5 ° C.

  Test No. 1, the internal temperature distribution at the time of cooling off is 1.5 ° C. at the front 9 points, 3.3 ° C. at the middle 9 points, and −1.0 ° C. at the rear 9 points, and is within the set temperature. doing. By installing the cold air duct 38, the blown cold air c of the air cooler 28 reaches the rear part, and the opening area of the upper opening 24 and the lower opening 26 of the bulkhead 22 is set as described above. In addition, a split flow of the cold air c is formed in the gaps s3 and s4, and an upper circulation flow c1 and a lower circulation flow c2 directed forward are formed, and the cold air c does not short-circuit to the suction port 34 of the air cooler 28. It can be said that it is the best condition.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. The configuration of the cool box 12 shown in FIG. 7 is obtained by eliminating the upper opening 24, and the opening ratio of the lower opening 26 is the same as that of the first embodiment. Other configurations such as the cold air duct 38 are the same as those in the first embodiment. The test conditions and test results of this embodiment are shown in Test No. 1 in Table 1 (FIG. 5). It is shown in 2.
FIG. 7 shows the flow state of the cold air c under the test conditions. As shown in FIG. 7, also in this case, an upper circulation flow c1 along the upper surface of the load f and a lower circulation flow c2 passing below the load f were formed, and the internal temperature distribution could be made substantially uniform.

In this case, the internal temperature distribution at the time of cooling off is −0.8 ° C. at the front 9 points, 5.1 ° C. at the central 9 points, and −2.0 ° C. at the rear 9 points. The set temperature has not reached 3 ° C.
This is because the cold air c emitted from the cold air duct 38 passes through the load space S from the uppermost surface of the load f to the ceiling surface 13 in the cool box and reaches the rear part, and the gap s3 and the gap between the front and rear loads f. The flow is divided into s4, passes through the circulation hole on the top surface of the pallet, and then is divided into the lower circulation flow c2 reaching the lower opening 26 of the bulkhead 22 and the clearance s3 of the front load f and passes through the circulation hole on the top surface of the pallet. However, it is considered that the cold air c did not spread so much in the middle region because it was separated from the upper circulation flow c1 reaching the lower opening 26 of the bulkhead 22.

(Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to FIG. The structure of the cool box 12 shown in FIG. 8 is such that the upper opening 24 is enlarged and the opening area is 5% of the total cross-sectional area of the cool box 12 (0.5 times the lower opening 26). The opening ratio of the lower opening 26 is the same as that of the first embodiment, and other configurations such as the cold air duct 38 are the same as those of the first embodiment. The test conditions and test results of this embodiment are shown in Test No. 1 in Table 1. 3 shows. FIG. 8 shows the flow state of the cold air c under these test conditions.

Also in this case, the upper circulating flow c1 and the lower circulating flow c2 could be formed in the longitudinal direction of the cold storage box 12, and the temperature distribution in the storage could be made uniform. The internal temperature distribution at the time of cooling off was 3.7 ° C. at the front 9 points, 4.3 ° C. at the middle 9 points, and 2.7 ° C. at the rear 9 points.
As shown in FIG. 8, the cold air c from the air outlet 40 of the cold air duct 38 passes through the cargo space S and reaches the rear part, and is divided into the rear gaps s3 and s4 and distributed on the upper surface of the pallet. A part that passes through the hole and reaches the lower opening 26 of the bulkhead 22 and a part that immediately returns and reaches the upper opening 24 of the bulkhead 22 along the upper surface of the load f. It is thought that there was not.

  Therefore, if the opening area of the upper opening 24 is further increased, the amount of cold air that immediately returns to the bulkhead 22 out of the cold air c that has exited from the air outlet 40 increases, so that the temperature distribution in the longitudinal direction of the cool box 12 is increased. There is a risk of non-uniformity. Therefore, the ratio of the opening area of the upper opening 24 to the lower opening 26 is preferably 0.1 to 0.5 times.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. The structure of the cool box 12 shown in FIGS. 9 and 10 is such that the width of the cold air duct 38 is made smaller than the width of the cool box 12 and its length is extended to the vicinity of the rear door 18. Other configurations are the same as those of the first embodiment including the opening areas of the upper opening 24 and the lower opening 26. The test conditions and test results of this embodiment are shown in Test No. 1 in Table 1. 4 shows. FIG. 9 shows the flow state of the cold air c under these test conditions.

In the present embodiment, the temperature distribution in the refrigerator at the time of cooling off is −1.2 ° C. at the front 9 points, 0.4 ° C. at the middle 9 points, and 9 points at the rear − It became 4.3 degreeC.
In this case, the cold air c flows in the gaps s3 and s4 over the entire area of the cool box 12, and the upper circulation flow c1 along the upper surface of the load f and the lower circulation flow c2 flowing in the pallet 20 at the lower part of the load can be formed. The temperature distribution could be made almost uniform over the entire area of the cool box.

However, since the cold air duct 38 was lengthened, the pressure loss of the cold air duct 38 was increased, and the amount of air blown from the outlet 40 was reduced. Along with this, the temperature of the cold air blown from the air cooler 28 also decreased. Moreover, since the blower outlet 40 is located in the vicinity of the rear end, the cold air c is concentrated on the rear part. For this reason, the rear temperature is significantly lower than the set temperature.
Thus, although the set temperature has been reached, in a refrigerator with a refrigerated temperature zone specification, if the internal temperature is below freezing, the cargo (food) freezes and the operating rate of the refrigerator increases, so that the engine drive There is a concern that the operating time of the compressor will become longer and the fuel consumption will increase.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described with reference to FIG. In order to wipe out the concern in the fourth embodiment, when a long cold air duct reaching the vicinity of the rear end of the cool box is used, the configuration shown in FIG. 11 is preferable. In FIG. 11, the configuration of the cold air duct 38 is the same as that of the fourth embodiment except for the following points. That is, a large number of louver outlets 42 are provided on the lower surface of the cool air duct 38 in the region from the central region to the end of the cool air duct 38 extending to the vicinity of the rear end of the cool box 12. The angle of each slat is adjusted as appropriate so that the upper circulation flow c1 and the lower circulation flow c2 can be formed over the entire longitudinal direction of the cool box 12.

  With this configuration, the cold air c can be blown out uniformly in the region from the central region to the rear portion, so that the temperature of the rear portion is not particularly lowered. Further, the provision of the louver type air outlet 42 can reduce the pressure loss from the central region to the end region of the cold air duct 38, leading to an increase in fuel consumption of the engine that drives the compressor of the refrigerator. Absent.

(Embodiment 6)
Next, a sixth embodiment of the present invention will be described with reference to FIGS. In the first to fifth embodiments, since the cold air duct 38 is connected to the cold air outlet 36 of the air cooler 28, the air volume is reduced due to the pressure loss in the cold air duct 38. Therefore, it is necessary to increase the fan capacity in consideration of the pressure loss of the cold air duct 38. In the test results of the present inventors, in the configurations of the first to fifth embodiments, the air volume and the static pressure of the heat exchanging unit 33 are 3261 m ³ / h and 44 Pa when the cold air duct 38 is not installed, It was 2876 m ³ / h and 58 Pa in the case where a duct was installed.

However, in a cold car such as a refrigerator car or a freezer car, the size of the fan is limited because the space of the cool box is limited. Therefore, in this embodiment, only the fan 54 is installed inside the casing 52 of the air cooler 50, and the cooling pipe 58 constituting the heat exchanging portion is arranged in the cold air duct 56. In the casing 52, a suction port 60 is formed on the suction side of the fan 54, and a blowout port 62 is formed on the blowout side of the fan 54.
With this configuration, a large space for installing the fan 54 can be taken. Therefore, the size of the fan 54 can be increased, and the capacity of the fan 54 can be increased.

  According to the present invention, with simple equipment, the temperature distribution can be made uniform throughout the entire area of the cold storage mounted in a transport vehicle such as a cold car, and the cold temperature of a load such as food can be desired without variation. Temperature can be maintained.

1 is an overall configuration diagram of a cold-storage vehicle according to a first embodiment of the present invention. It is a top view inside the cool box of the cool truck according to the first embodiment. It is sectional drawing which follows the AA line in FIG. It is a longitudinal cross-sectional view which shows the flow of the cold wind in the cool box which concerns on the said 1st Embodiment. It is a graph which shows the test result of 1st-4th embodiment of this invention. It is a diagram which shows the temperature distribution in the cool box which concerns on the said 1st Embodiment. It is a longitudinal cross-sectional view which shows the flow of the cold wind in the cool box which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the flow of the cold wind in the cool box which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the flow of the cold wind in the cool box which concerns on 4th Embodiment of this invention. It is a top view inside the cool box of the cool truck according to the fourth embodiment. It is a longitudinal cross-sectional view which shows the flow of the cold wind in the cool box which concerns on 5th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the flow of the cold wind in the cool box which concerns on 6th Embodiment of this invention. It is a top view inside the cool box of the cool truck according to the sixth embodiment.

Explanation of symbols

10 Cold truck (transportation)
12 Cold storage 13 Ceiling surface 14 Driver's seat 15 Front wall 18 in the compartment 18 Rear door 20 Pallet 21 Pallet upper surface 22 Bulkhead 24 Upper opening 26 Lower opening 28, 50 Air cooler 34, 60 Air inlet 36, 40, 62 Air outlet 38 , 56 Cold air duct 42 Louver type outlet 32, 54 Fan 58 Cooling pipe S Load space f Load c1 Upper circulation flow c2 Lower circulation flow c3 Cold air split flow s1 Ventilation space s2 Clearance (return flow path)
s3, s4 gap

Claims (6)

In a cool box equipped with an air cooler mounted on a transport and having an inlet and an outlet at one end of the cargo space,
A cold air duct is connected to the air cooler, the cold air duct is extended to at least a central area of the cargo space along the ceiling surface, and the cold air is blown out from the outlet of the extended end;
The cool air blown out from the outlet is returned from the end area of the load space along the uppermost surface of the load toward the air cooler inlet, and the load is placed by descending from the end area of the load space. Forming a lower circulation flow returning toward the suction port through the ventilation space formed in the pallet, and a return passage for guiding the upper circulation flow and the lower circulation flow to the suction port ,
A slit-like upper opening that allows a bulkhead to stand upright with a gap between the air cooler and a nearby inner wall, and distributes the upper circulation flow to the bulkhead above the maximum load height. And a slit-like lower opening through which the lower circulating flow is circulated on a surface of the bulkhead facing the ventilation space of the pallet .   The air flow hole is provided in the upper surface of the pallet, and a split flow of cold air that passes from the upper side to the lower side through a gap formed between the loads separated from the upper circulation flow is formed. Cold storage.   The cold air duct is extended across the load space to the end region of the load space, and at least a cold air outlet hole is provided on the lower surface of the cold air duct from the central region to the end region. Cold storage.   2. The air cooler according to claim 1, wherein a cooling pipe for flowing a refrigerant or a latent heat storage material is disposed in a ventilation space inside the cold air duct, and a fan for forming cold air in the cold air duct is provided in the air cooler. Cold storage. The opening area of the lower opening with a equal to or more than the opening of the ventilation space of the pallet, to claim 1, characterized in that the opening area of the upper opening was 0.1 to 0.5 times the lower opening The listed cold storage.   The transport vehicle is a cold storage vehicle, the air cooler is disposed on an upper part of the inner side wall in the vicinity of a driver's seat, and the cold air duct is extended from the air cooler toward the rear door. Item 2. The cold storage box according to item 1.

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